Java nio导入csv对账文件

公司业务上传支付宝、微信交易记录，并和系统进行对账 功能

个人使用了，java 的nio  和 多线程进行扫描文件 并装载bean对象，具体代码如下：

附件有对应的工具类，一直上传失败,放到百度云盘，有需要的可以取下载：链接: https://pan.baidu.com/s/1y-I36iUAQbx2_Ss1Ih8ASQ 提取码: meng 

 

@RequestMapping(value = "checkReconciliationData/{channel}", method = RequestMethod.POST)
public CResponse checkReconciliationDataNew(@RequestParam("file") MultipartFile file, @PathVariable String channel)throws IOException {
    if (file != null && !file.isEmpty()) {
        String fileName = file.getOriginalFilename();
        UploadPayDataRequest uploadPayDataRequest = new UploadPayDataRequest();
        uploadPayDataRequest.setFileName(fileName);
        List<UploadPayDataEntity> uploadPayDataEntities = uploadPayDataService.selectInfoByList(uploadPayDataRequest);
        if (uploadPayDataEntities.size() > 0) {
            return CResponse.error(ResultCodeEnum.ERROR_DATA_FORMAT, "文件已存在,无需重复上传！");
        }
        String keyName = MD5.MD5Encode(fileName);
        System.out.println("keyName:" + keyName);
        String keyValue = jedisCluster.get(keyName);
        if (keyValue == null) {
            jedisCluster.set(keyName, "PROCESSING");//文件处理中
            ExecutorService executorService = Executors.newSingleThreadExecutor();
            UploadPayDataDto uploadPayDataDto = new UploadPayDataDto();
            executorService.execute(() -> {
                try {
                    CommonsMultipartFile cf = (CommonsMultipartFile) file;
                    DiskFileItem fi = (DiskFileItem) cf.getFileItem();
                    File f = fi.getStoreLocation();
                    BigFileReader.Builder builder = new BigFileReader.Builder(f, line -> {
                        if (line.indexOf("渠道") == -1) {
                            String[] strs = line.split(",");
                            String json = JSONObject.toJSONString(setItem(strs, channel, fileName));
                            jedisCluster.lpush(fileName, json);
                        }
                    });
                    BigFileReader bigFileReader = builder
                            .threadPoolSize(10)
                            .charset(Charset.forName("GBK"))
                            .bufferSize(1024).build();
                    bigFileReader.start(jedisCluster, keyName);
                    upload(file);
                } catch (Exception e) {
                    log.error("异步操作文件内容失败，原因：" + e.getMessage());
                    jedisCluster.del(keyName);
                }
            });
            BufferedInputStream bis = new BufferedInputStream(file.getInputStream());
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(bis, "GBK"), 30 * 1024 * 1024);//10M缓存
            uploadPayDataDto.setTotalNum(bufferedReader.lines().count());
            uploadPayDataDto.setUrl(ALIYUN_IMAGE_URL + fileName);
            uploadPayDataDto.setFileName(fileName);
            return CResponse.success(uploadPayDataDto);
        } else {
            return CResponse.error(ResultCodeEnum.ERROR_DATA_FORMAT, "文件处理中");
        }
    } else {
        return CResponse.error(ResultCodeEnum.ERROR_DATA_FORMAT, "文件数据为空");
    }
}

public class BigFileReader {
    private int threadPoolSize;
    private Charset charset;
    private int bufferSize;
    private IFileHandle handle;
    private ExecutorService executorService;
    private long fileLength;
    private RandomAccessFile rAccessFile;
    private Set<StartEndPair> startEndPairs;
    private CyclicBarrier cyclicBarrier;
    private AtomicLong counter = new AtomicLong(0);


    public BigFileReader(File file, IFileHandle handle, Charset charset, int bufferSize, int threadPoolSize) {
        this.fileLength = file.length();
        this.handle = handle;
        this.charset = charset;
        this.bufferSize = bufferSize;
        this.threadPoolSize = threadPoolSize;
        try {
            this.rAccessFile = new RandomAccessFile(file, "r");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        this.executorService = Executors.newFixedThreadPool(threadPoolSize);
        startEndPairs = new HashSet<>();
    }

    public void start(JedisCluster jedisCluster, String fileName) {
        long everySize = this.fileLength / this.threadPoolSize;
        try {
            calculateStartEnd(0, everySize);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }

        final long startTime = System.currentTimeMillis();
        cyclicBarrier = new CyclicBarrier(startEndPairs.size(), () -> {
            System.out.println("use time: " + (System.currentTimeMillis() - startTime));
            System.out.println("all line: " + counter.get());
            System.out.println(fileName);
            jedisCluster.set(fileName, "SUCCESS");
            shutdown();
        });
        for (StartEndPair pair : startEndPairs) {
            System.out.println("分配分片：" + pair);
            this.executorService.execute(new SliceReaderTask(pair));
        }
    }

    private void calculateStartEnd(long start, long size) throws IOException {
        if (start > fileLength - 1) {
            return;
        }
        StartEndPair pair = new StartEndPair();
        pair.start = start;
        long endPosition = start + size - 1;
        if (endPosition >= fileLength - 1) {
            pair.end = fileLength - 1;
            startEndPairs.add(pair);
            return;
        }

        rAccessFile.seek(endPosition);
        byte tmp = (byte) rAccessFile.read();
        while (tmp != '\n' && tmp != '\r') {
            endPosition++;
            if (endPosition >= fileLength - 1) {
                endPosition = fileLength - 1;
                break;
            }
            rAccessFile.seek(endPosition);
            tmp = (byte) rAccessFile.read();
        }
        pair.end = endPosition;
        startEndPairs.add(pair);

        calculateStartEnd(endPosition + 1, size);

    }

    public void shutdown() {
        try {
            this.rAccessFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        this.executorService.shutdown();
    }

    private void handle(byte[] bytes) throws UnsupportedEncodingException {
        String line = null;
        if (this.charset == null) {
            line = new String(bytes);
        } else {
            line = new String(bytes, charset);
        }
        if (line != null && !"".equals(line)) {
            this.handle.handle(line);
            counter.incrementAndGet();
        }
    }


    private static class StartEndPair {
        public long start;
        public long end;

        @Override
        public String toString() {
            return "star=" + start + ";end=" + end;
        }
    }

    private class SliceReaderTask implements Runnable {
        private long start;
        private long sliceSize;
        private byte[] readBuff;

        public SliceReaderTask(StartEndPair pair) {
            this.start = pair.start;
            this.sliceSize = pair.end - pair.start + 1;
            this.readBuff = new byte[bufferSize];
        }


        @Override
        public void run() {
            try {
                MappedByteBuffer mapBuffer = rAccessFile.getChannel().map(FileChannel.MapMode.READ_ONLY, start, this.sliceSize);
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                for (int offset = 0; offset < sliceSize; offset += bufferSize) {
                    int readLength;
                    if (offset + bufferSize <= sliceSize) {
                        readLength = bufferSize;
                    } else {
                        readLength = (int) (sliceSize - offset);
                    }
                    mapBuffer.get(readBuff, 0, readLength);
                    for (int i = 0; i < readLength; i++) {
                        byte tmp = readBuff[i];
                        //碰到换行符
                        if (tmp == '\n' || tmp == '\r') {
                            handle(bos.toByteArray());
                            bos.reset();
                        } else {
                            bos.write(tmp);
                        }
                    }
                }
                if (bos.size() > 0) {
                    handle(bos.toByteArray());
                }
                cyclicBarrier.await();//测试性能用
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static class Builder {
        private int threadSize = 1;
        private Charset charset;
        private int bufferSize = 1024 * 1024;
        private IFileHandle handle;
        private File file;

        public Builder(File file, IFileHandle handle) {
            this.file = file;
            if (!this.file.exists())
                throw new IllegalArgumentException("文件不存在！");
            this.handle = handle;
        }

        public Builder threadPoolSize(int size) {
            this.threadSize = size;
            return this;
        }

        public Builder charset(Charset charset) {
            this.charset = charset;
            return this;
        }

        public Builder bufferSize(int bufferSize) {
            this.bufferSize = bufferSize;
            return this;
        }

        public BigFileReader build() {
            return new BigFileReader(this.file, this.handle, this.charset, this.bufferSize, this.threadSize);
        }
    }

}

public interface IFileHandle {
    void handle(String line);
}